Typewriting machine



I J. LINDBURG TYPEWRIT ING MACHINE Jan. 29, 1929. 1,700,322

Filed May 23, 1925 9 In en fan y I f I Afro/w f Patented Jan. 29, 1929.

UNITED STATES PATENT" ()FFICE.

JQSEPI-I LINDBUBG, 0E BROOKLYN, NEW YORK, ASSIGEJBR UNDERW'OOD ELLIOTT FISHER COMPANY, OF NEW YORK, 11'. Y., A CORPORATIOI Q' OF DELAWARE.

TYPEWRITING MACHINE.

This invention relates to stencil-attachments for front-strike typewriting machines in which a stencil-card is line-spaced by raising the card in fiat condition step by step. A machine of this type is disclosed in patent to Elliott, 1,378,771, dated May li', 192i.

fihiid type of machine is provided with a rock-frame mounted at the rear, and the card clamped to the forward end of the frame. A line-space mechanism raises the frame.

One of the features of this invention relates to means for preventing accidental displacement of the rock-frame, as when the machine tipped back for any reason. In drop desks, the machine is secured to the desk-top and is lowered into an opening of the desk in an inclined. position, and the machine may be jerked, throwing the stencil-frame against the walls of the desk anddamaging both the stencil-device and the machine. By this invention locking means are provided to prevent the displacement of the stencihfranie relative to the carriage of the machine upon which the stencil'device is mounted.

Means are also provided to facilitate the attaching to and detaching from an Underwood standard typewriter a stencil-device of the Elliott type' Novel locking means coniprise slot-ted studs fast to the carriage, the slots of which receive fiat locking pieces mounted on the stencil-device.

in some cases it desirable to use a con- -t -inueusstrip oaf cellu loid around the platen, the strip he "held thereon by means of the h n so a-i. feed rol l One of the features of 'the inven-tion relates to means, including-a plate, for controlling the rotationoi the platen when the stencil-device is attached to theinachine, in o :ler to protect the type from striking a clip \vlllcll normally supports the celluloid strip around the piston. Thep'late is swingable out of engagement with the platen to permit the continued feeding of the celluloid strip.

-Other features and advantages-will hereinafter appear.

In the accompanying drawing,

Figure 1 is a plan view of the stencil-device as applied to an Underwood standard typewriting' machine.

FighreQ is a side view, in elevation, showing the device ofl the machine Figure 3 is a perspective view "of the lock and the means for preventing the full rota-. tion of the platen.

Figure 4e is a side View, in elevation, of the stoned-device applied to an Underwood standard typewriting machine.

Figure is a modification ot' the hacking shown in Figure 4, and shows an endless eel: luloid strip around the platen.

A stencil-card, not shown, is placed in a recess at the free end of a rockahly-mounted frame 1.0 and is held therein by ineansof'jaws l1, operable by a'iingier-piece 1.2, which is pressed against a second finger-p ece 1.3 firs to the frame. Then the cal-ad is lowered to the printing position .andis out by the successive striking of the types '14: against a plat, 15, in a mannershown in said pa; nt to ott. The frame 1.0 comp connected bv a reinforc crumed upon a cross-bar having on o-menibers 19 des the .covereplates 20 On the frameof the machine.

the form of an attachment t0 {1 frame of Underwood standard type ing; machine, and it is one of the teat thereof that the same may. be quick y attached to and removed from the in time permit the use-ofthe machine ml or a S ZQDCi lwCIH' JLGY or as an ordinary ,typewi To thi. l, some cha es jniade to the nwh-ine itscii previous to re... iving the stenrilvice thereon; However, t made on the ,n'iach-ine are sucl-i th,. v 1,1 not interfere with the ;1 operation of the machine as a typewriter. Qneofthe chan s relates to the addition cf s 21 to theei l cover nlates '20 of the p ateirframe. Said studs pro ided with s'lotsQQ receiving pieces 28 "to lock the etencil deyice to the QO'XIGZv-P'lZLlIC-B. The pieces 23 are pivotally mounted at 2.4:, and areheild on the end mem- I the hho'ld tne pieces 'th the slots 22 of the studs The members 119 are provided with elongated slotsflilrto clear screws on th e platenframe in any forward :or ;.r;earwa,r d adjusted position of the end plates 20; it will be noted that these plates are provided with smaller slots through which screws 3G pass, which slots are provided so that the stencihdevice can be adjusted forwardly and rearwardly by moving the cover-plates in either direction. This provides means whereby the stencilcard may be adjusted to proper position against the platen of the typcwriting machine.

In this invention, there is provided a celluloid strip 46, the same as shown. in the application of Alfred G. F. Kurowski, Serial No. 708,332, filed April 23, 1924 (new Patent No. 1,608,219, dated November 23, 1926), which serves as a backing for the platen to facilitate the cutting of the stencil. The strip is held on the platen by means of a metal clip, and, in order to prevent the clip from being positioned in the striking field of the types, there is also provided a stop device 31 as an abutment for a projecting pin on the end of the platen. Stop-device 31 has sufficient length so that the pin on the platen will engage either end of it before the metal clip gets to the striking field of the types. The stop-device is pivotally mounted upon a shaft 32 and secured thereto by means of a set screw 33 that it may be swung out of the way, as shown in Figure 5, in case it is desired to use a continuous strip of celluloid 34, such as disclosed in the application of Jesse A. B. Smith, Serial No. 11,952, filed February 27 1925 (now Patent No. 1,623,455, dated April 5, 1927).

In order that the rockably-mounted frame of the stencil-device may be locked against displacement relative to the carriage, there 1s provided a locking device 35, which is pivotally mounted upon the shaft 32 on the fixed frame and engages the shaft 36, rotatably mounted on the rocking frame. The locking device 35 is made of a rectangular sheet metal strip Wound around the shaft 32 at 37, forming an eye and extending upwardly, forming a resilient hook 38 for embracing the hub 39 of a finger-wheel 40. The locking device is made slightly shorter than the distance between the centers, so that the hook will slightly spring for resiliently holding the locking device in engagement. V] hen it is desired to operate the machine, the locking device is thrown rearwardly to a position shown in d0t-and-dash lines, in Figure 4, so as to permit the raising of the free end of the frame by the action of the finger-wheel 4O actuating a cam 41 which is hacked by a roller 42 borne by the shaft 36. As the cam is rotated, a spring, not shown, is wound around the shaft and the cam is held in place bya pawl 43 engaging with a ratchet 44, the pawl being released at the same time the jaws are opened by a link 45 operatively connecting the two members. 1

Variations may be resorted to within the ing field in front of the platen, said stencil device comprising a fixed frame, a shaft on the fixed frame for supporting a rockable frame thereon and means for raising the free end of the rockable frame to line-space the card, and means for locking said rockable frame against displacement relatively to the carriage.

2. The combination with a typewriting machine having a revoluble platen, a carriage,

and typing instrun'ientalities, of a stencil device borne by said carriage and effective to present a stencil-card to the printing field'in frontof the platen, said stencil device comprising a fixed frame, a shaft on the fixed frame for supporting a rockable frame thereon and means for raising the free end of the rockable frame to line-space the card, and means for locking said rockable frame against displacement relatively to the carriage, said last-mentioned means comprising a latch pivotally mounted onthe fixed frame of the stencil device and engaging with the shaft on the rockably mounted frame.

3. A stencil-card-holding unit for typewriting machines, including a base-frame having members shaped to engage the ends of the platen-frame of the machine and detachably supporhsaid unit in superimposed relation with the platen-frame, and a swing able stencil-card holding and feeding mechanism mounted upon said base-frame, said base-frame and mechanism having co-operatiug parts operable to detachably lock said mechanism against swinging movement on the base-frame, one of said parts having a resiliently hook-shaped portion to engage and bind upon the other part.

4. A stencil-card-holding unit for-typewriting machines, including a base-frame hav'in g members shaped to engage the ends of the platen-frame of the machine to detachably support said unit in superimposed relation with the platen-frame, and a swingable stencil-card holding and feeding mechanism mounted upon said base-frame, said baseframe and mechanism having co-operating parts operable to detachably lock said mechanism against swinging movement on the base frame, said parts including a. rigid member and a pivotally-mounted resilient member shaped to detachably engage the rigid member and effective to frictionally bind upon the latter by virtue of its own resiliency. V 5. A stencil-card-holding unit for typewriting machines, including a. base-frame Ill) having members shaped to engage the ends of the platen-frame of the machine to detachably support said unit in superimposed relation with the platen-frame, and a'swingable stencil-card holding and feeding mechanism mounted upon said base-frame, said baseframe, and mechanism having eo-operating parts operable to detachably lock said mechanism against swinging movement on the baseframe, said parts including a rigid member and a pivotally-mounted resilient member shaq ied to detachably engage the rigid member and effective to frictionally bind upon the latter by virtue of its own resiliency, said resilient member also having a finger-piece to aid in. engaging and disengaging themember.

6. The combination with a typewriting machine having a revoluble platen and a carriage therefor, of a stencil device having means for temporarily attaching the same to the carriage, said stencil device comprising a roekably mounted frame and means for raising the free end of the frame to line-space a stencil-card supported by its uppermost edge upon the free end of said frame, and means for locking said rockable frame against displacement relatively to the carriage.

7. The combination with a typewriting machine having a revoluble platen and a carriage therefor, of a stencil device having means for temporarily attaching the same to the carriage, said stencil device comprising a rockably .monnted frame and means for raising the free end of the frame to linespace a stencil-card supported by its uppermost edge upon the free end of said frame, and means for locking said rockable frame against displacement relatively to the carriage, said last-mentioned means including a hook mounted on a fixed shaft of the stencil device and co operating with a shaft mounted on the rockable frame, said hook being positioned on the shaft by means of two set collars. 8. The combination with a typewriting machine having a platen, a carriage, and typing instrumentalities, of a detachable frame borne by the carriage, a displaceable frame carried by said detachable frame above the platen, means for elevating the displaceable frame above the platen step by step to linespace a card, and a releasable latch-piece carried by the detachable frame and engageable with the. displaceable frame to releasably secure the latter against accidental displacement when not in use.

9. The combination with a typewriting machine having a revoluble platen and a traveling carriage therefor, of a stop assoeiated with the platen, said stop being positionable to intercept a pin carried by the platen, whereby to limit the rotation thereof, said stop being also swingable away from the platen to a position out of the path of said pin, to permit free rotation of said platen.

JOSEPH LINDBURG. 

